Remapping pen buttons to different functions?

Hello all,
As we all know the TouchSmart tx2 pen doesn't have an eraser and the button on the pen is bound to right click.
Is it possible to change this so I can use the button on the pen as an eraser?
If I could do this for One Note alone I would be ecstatic.

Unfortunately for me, the only option I have for the pen button is:
"Use the pen button as a right click equivalent"
This may be due to the fact that I am using Windows 7.
Are there any external programs I can use or anything of that sort?
Is it possible to modify OneNote's button mapping scheme?

Google kept directing me here last night when I wondered how to do this when I did a reinstall of my tablet with an ntrig stylus, as I'd liked using the pen as an an eraser in MsOneNote. The whole use the eraser where available thing.. If your touchsmart is using the Ntrig stylus this might work: